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A constitutive model for Ti6Al4V considering the state of stress and strain rate effects

Article dans une revue avec comité de lecture
Author
CHENG, Wenyu
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
OUTEIRO, José
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
COSTES, Jean-Philippe
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
M'SAOUBI, Rachid
498636 Seco Tools AB [Seco Tools AB]
KARAOUNI, Habib
300457 SAFRAN Group
ASTAKHOV, Viktor
558627 Production Services Management inc. [PSMi]

URI
http://hdl.handle.net/10985/18139
DOI
10.1016/j.mechmat.2019.103103
Date
2019
Journal
Mechanics of Materials

Abstract

The predictability of manufacturing process simulation is highly dependent on the accuracy of the constitutive model to describe the mechanical behavior of the work material. The model should consider the most relevant parameters affecting this behavior. In this study, a constitutive model for Ti6Al4V titanium alloy is proposed that considers both material plasticity and damage. It includes the effects of strain hardening, strain-rate and the state of stress to represent the mechanical behavior of Ti6Al4V titanium alloy in metal cutting simulation. To generate states of stress and strain rates representative of this process, mechanical tests were performed using a specific experimental setup. This included a specimen geometry designed to generate different states of stress, as well as a digital image correlation technique to obtain the strains during the mechanical tests. For the determination of the coefficients of the constitutive model, the yield stress and fracture locus obtained from these tests were used in an optimization-based procedure. To verify the accuracy of the proposed constitutive model to represent the mechanical behavior of the Ti6Al4V alloy under different states of stress, force–displacement curves obtained using this model and the Johnson-Cook model are compared with the curves obtained experimentally.

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